关于 flashback transaction query

Question

我的数据库版本如下：
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
我在一张表的执行了几个操作，通过flashback versions query 可以看到如下内容：
SQL> select versions_startscn,versions_endscn,versions_xid,versions_operation,versions_starttime,versions_endtime,tt.id,tt.name from tt versions between scn minvalue and maxvalue order by versions_startscn;
VERSIONS_STARTSCN VERSIONS_ENDSCN VERSIONS_XID V VERSIONS_STARTTIME VERSIONS_ENDTIME ID NAME
1239547 1239632 08001C00C3030000 I 24-OCT-12 11.25.03 AM 24-OCT-12 11.27.39 AM 1 tan
1239632 1239801 04001A0016030000 U 24-OCT-12 11.27.39 AM 24-OCT-12 11.31.13 AM 1 jia
1239801 1239836 02001700B7030000 U 24-OCT-12 11.31.13 AM 24-OCT-12 11.32.31 AM 1 ping
1239836 0A000D000B030000 D 24-OCT-12 11.32.31 AM 1 ping
但是：
SQL> select * from flashback_transaction_query where table_name='TT';
XID START_SCN START_TIM COMMIT_SCN COMMIT_TI LOGON_USER UNDO_CHANGE# OPERATION TABLE_NAME TABLE_OWNER ROW_ID UNDO_SQL
02001700B7030000 1239632 24-OCT-12 1239801 24-OCT-12 SCOTT 1 UNKNOWN TT
04001A0016030000 1239547 24-OCT-12 1239632 24-OCT-12 SCOTT 1 UNKNOWN TT
08001C00C3030000 1239546 24-OCT-12 1239547 24-OCT-12 SCOTT 1 UNKNOWN TT
0A000D000B030000 1239801 24-OCT-12 1239836 24-OCT-12 SCOTT 1 UNKNOWN TT
可以看到当查询 flashback_transaction_query 时，却看不到UNDO_SQL 并且OPERATION为UNKNOWN，有哪位大神遇到过此问题，求助！

Answer 1

SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE    11.2.0.3.0      Production
TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
SQL> drop table people purge;
drop table people purge
ERROR at line 1:
ORA-00942: table or view does not exist
SQL> create table people(empno number primary key, empname varchar2(16), salary
  2  number);
Table created.
SQL> insert into people values(111,'James', 100);
1 row created.
SQL> create table dept(deptno number, deptname varchar2(32));
Table created.
SQL> insert into dept values(10, 'Accounting');
1 row created.
SQL>
SQL> commit;
Commit complete.
SQL>
SQL> update people set salary = salary + 100 where empno = 111;
1 row updated.
SQL> insert into dept values(20, 'Finance');
1 row created.
SQL>
SQL> delete from people where empno=111;
1 row deleted.
SQL>
SQL> insert into people values(111,'Tom', 100);
1 row created.
SQL> update people set salary = salary + 100 where empno = 111;
1 row updated.
SQL> update people set salary = salary + 50 where empno = 111;
1 row updated.
SQL> commit;
Commit complete.
SQL>
SQL> select versions_xid xid, versions_startscn start_scn, versions_endscn
  2  end_snc,
  3  versions_operation operation, empname, salary
  4  from people
  5  versions between scn minvalue and maxvalue
  6  where empno = 111
  7  order by start_scn
  8  /
XID               START_SCN    END_SNC OP EMPNAME
    SALARY
0900120064060000    2391498    2391514 I  James
       100
0A000D0068060000    2391514            I  Tom
       250
0A000D0068060000    2391514            D  James
       100
  1* select undo_sql,OPERATION from flashback_transaction_query where table_name='PEOPLE' order by start_scn
SQL> /
UNDO_SQL                                           OPERATION
                                                   UNKNOWN
                                                   UNKNOWN
                                                   UNKNOWN
                                                   UNKNOWN
                                                   UNKNOWN
                                                   UNKNOWN
6 rows selected.
        这是一个 flashback_transaction_query 在11.2的一个BUG
Hdr: 9056188 11.2.0.1.0 RDBMS 11.2.0.1.0 LOGMINER PRODID-5 PORTID-46
Abstract: FLASHBACK_TRANSACTION_QUERY IS NOT SHOWING ANY UNDO_SQL
该BUG似乎一直没有被FIX
REPRODUCIBILITY:
Reproduable atwill in 11.2
Not reproducing in 11.1.0.7